Pipe-coupling.



PATENTED APR. 4, 1905. J. N. GOODALL. PIPE COUPLING. APPLIOATION FLEDJUNE 15,1904.

UNITED STATES Patented April 4, 1905.

PATENT OFFICE.

JOHN N. GOODALL, OF PORTSMOUTH, NEW HAMPSHIRE, ASSIGNOR OF ONE-HALF TOCHARLES A. TOLMAN, OF KITTERY, MAINE.

PlPE-COUPLING.

SPECIFICATION formng part of Letters Patent NO. 7 86,558, dated April 4,1905.

Application filed June 15,1904=. Serial No. 212,(523.

To (LN, whom, it may cancer-n:

Be it known that I, JOHN N. GooDALL, a citizen of the United States, anda resident of Portsmouth, in the County of Rockingham and State of NewHampshire, have in vented an Improvement in Pipe-Couplings, of which thefollowing description, in connection with the accompanying drawings, isa specification,like numerals on the drawings representing like parts. i

This invention relates to a coupling member adapted tobe used betweenlengths or sections of conduit-pipes; and it has for ts object toprovide a novel device of this character which can be 'eadilydisconnected from one or both of the conduit-pipe ends thus connectedand which when thus disconnected will leave a considerable space or gapto facilitate the drawing in ot' wires or conductors into theconduit-pipes. As is well known, these conduits for conductors are putinto a building, ship, 860., when it is being built and at somesubsequent period the electric Wires or conductors are drawn into theconduits, and to facilitate this operation outlet-boxes are placed atvarious intervals into which the conduits lead.

In some situations it is not convenient or ,appropriate to place aregular outlet-box, but

at the same time it is very desirable that the wireman, who is drawingin or inserting the conductors, should have access to the interior ofthe conduit at such places in order to facilitate the operation ofdrawing in the wires.

My improved coupling device is especially designed for use under suchconditions, for

. When in place, it forms an extension of the conduitflut it is soconstructed that it can be disconnected from one of the Conduit-sectionsand telescoped together, thereby afl'ording an open space in the conduitof suflicient length for the wireman to accomplish his purpose.

My improved coupling device comprises a barrel member having its centralportion of enlarged diameter and having reduced ends, both of which areinteriorly screW-threaded and the outer end ot' which is screw-threadedto an end of one of the Conduit-sections, and a pipe-sectionnon-detachable from the barrel member and adapted to telescopetherewithin, 5 the inner end of said pipe-section being provided withexterior screw-threads to engage the interior screw-threads of the innerend of the barrel-section and the outer end of the pipe-section beingadapted to be securcd to the end of the other conduit. The 'barrelmember is considerably shorter than the gap between the two conduits tobe connected, and the combined length of the barrel and pipe section isjust equal to the length between the conduit ends thus connected.

The device will be more fully hereinafter described in reference to theaccompanying drawings, in which- Figure l is a section of my improvedcoup- 5 ling with the` parts disconnected from the conduits to beconnected. Fig. 2 isasimilar view of the coupling when in place; andFig. 3 is a sectional view showing the coupling detached from oneConduit, as it will be when conduc- 7 tors are being drawn into aconduit.

3 and L designate two conduits which are connected by my improvedcoupling, the adjacent ends of the conduits being separated, as shown.The end of the conduit t is exteriorly screw-threaded, as at 5, and theend of the conduit 3 is shown as being provided with an ordinarycoupling 14, which is interiorly screw-tln'eaded. My improved couplingcomprises the barrel member 7 and the tubular 30 pipe-section 15. Thecentral portion of the barrel member has an enlarged diameter, and theends 8 and 9 thereof are reduced in size' and are provided with interiorscrew-threads 10 and 11; The pipe-section 15 is provided 5 at one endwith exterior screw-threads 16 to fit the interior screw-threads of the'coupling 1 1 and at the other end is slightly enlarged in diameter andis exteriorlyscrew-threaded, as at 6, the screw-threaded portion 6 beingoi' 9 a size to fit the interior screw-threads 10 ot' the barrel member.The screw-threads 16,

6, and 5 are preferably of the same pitch and are cut in the samedirection.

It will be noted that the screw-threads 6 have a slight taper and thatthe enlarged end of the pipe-section is of such a size that it cannot bescrewed out of the reduced end 8 of the barre] member. The pipe-seetionand barrel member are therefore non-detachable from each other.

In using my improved eoupling deviee the end 9 of the barrel is serewedto the conduit 4 and the pipe-section Secured to the conduit 3 at thetime when the said conduits are put' in place in the building, ship, orwherever they are to be used, all as shown in Fig. 2. When the wiremancomes to draw the conductors into the conduits, he turns the pipesection15 in a direction to uncouple it 'from the conduit 3, this operationresulting in unscrewing the head 6 thereof from'the screwthreads 10.Said pipo-section may then be telescoped within the barrel member, asshown in Fig. 3, thus making a gap between the end of the pipe-sectionand the conduit 3 of sufficient length to enable the wireman to draw theconductors into the conduit or to splice or repair conduetors alreadytherein. This necessary gap or space may also be afforded by turning thebarrel member so as to disconnect it from the conduit 4 and at the sametime unscrewing it from the head 6 and then telescoping said barrelmember over the pipesection. This latter operation would open a gapbetween the barrel member and the conduit 4.

It will be noted that the combined length of the pipo-section and barrelmember is equal to the distance between the ends of the conduits 3 and 4and that the barrel member is very much shorter than this distance. Inthe preferred form of my invention the pipo-section 15 is made slightlylonger than the barrel member, so that it may be telescoped within thebari-el member until the inner end engages the reduced end 9 of thebarrel member, and yet the screw-threaded end 16 thereof will projectbeyond the other end of the barrel member.

In manufacturing the barrel member I propose to make it of two parts,which are brazed or Secured together in any suitable way at the joint20, and in assembling the parts the pipe-section is first insertedthrough the reduced neck 8, and thereafter the two parts of the barrelmember are Secured together as above described.

Various changes may be made in the construction of the parts withoutdeparting from the invention.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

1. A coupling deviee for eonnecting two separated conduit ends,comprising a barre] member shorter than the distance between the ends ofthe conduits to be coupled, said barrel member having a central portionof enlarged diameter and reduced interiorlyscrew-threaded ends, theouter end adapted to be screw-threaded to one of the conduits,

and a pipe-section telescoping within the barrel member andnon-detachable therefrom, said pipe-section having on its inner end anexteriorly-screw-threaded head to engage the interior screw-threads onthe outer end of the barrel, and having its outer end adapted to bedetaehably Secured to the other conduit.

2. A coupling deviee for coupling together two separated conduit ends,comprising a barrel member shorter than the distance between the conduitends to be coupled, said barrel member having a central portion ofenlarged diameter and reduced interiorly-serew-threaded ends, the outerend of which is adapted to be screw-threaded to one conduit end, and apipe-section longer than the barrel member telescoping therewithin andnon-detachable therefrom, said pipe-section having on its inner end aneXteriorly-screw-threaded head to engage the inner screw-threads on theinner end of the barrel, the outer end of the pipesection beingserew-threaded to engage the other conduit end, the screw-threads onboth ends of the pipe-sections being of the same pitch and in the samedirection.

In testimony whereof I have signed my name to this specific-ation in thepresence of two subserbing witnesses.

JOHN N. GOODALL.

VVitnesses:

GEORGE H. SANDERSON, GEORGE R. BRITTON.

